Quick question

Hello everyone.
Thanks to BHW i've been reading on backlinks and such.
If your site isn't that hot, and you post backlinks on yahoo answers and some other sites, wouldn't that make YOUR site rank go down?

So then for example, if my site is on the sixth page for the keyword i'm targeting,
if i spread links through yahoo and youtube, wouldn't those appear first in the search engine since those are higher rank than mine?
your answer was kind of vague

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